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a, \(5\cdot\left(4+6\cdot x\right)=290\Rightarrow4+6\cdot x=290:5\Rightarrow4+6\cdot x=58\)
\(\Rightarrow6\cdot x=58-4\Rightarrow6\cdot x=54\Rightarrow x=54:6\Rightarrow x=9\)
b, \(\left(15\cdot24-x\right):0,25=100:\frac{1}{4}\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=100:\frac{1}{4}\)
\(\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=100\cdot\frac{4}{1}\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=400\)
\(\Rightarrow15\cdot24-x=400\cdot\frac{1}{4}\Rightarrow15\cdot24-x=100\Rightarrow360-x=100\)
\(\Rightarrow x=360-100\Rightarrow x=260\)
a) ( 1/2-1/3-1/6).(1/2+2/3+3/4+...+2017/2018) + 3/4.x = 9/10
0.(1/2+2/3+3/4+...+2017/2018) + 3/4.x = 9/10
0+3/4.x = 9/10
3/4.x = 9/10
x = 9/10: 3/4
x = 6/5
b) x + ( 3/1.3+3/3.5+...+3/13.15) = 11/5
x + 3/2. ( 1-1/3 + 1/3 - 1/5 + ...+ 1/13 - 1/15) = 11/5
x + 3/2. ( 1-1/15) = 11/5
x + 3/2.14/15 = 11/5
x + 7/5 = 11/5
x = 11/5 - 7/5
x = 4/5
4 x 113 x 25 - 5 x 112 x 20
= 100 x 113 - 100 x 112
= 100 x (113 - 112)
= 100 x 1
= 100
5 x ( 4 + 6 x X ) = 290
4 + 6 x X = 290 : 5
4 + 6 x X = 58
6 x X = 58 - 4
6 x X = 54
X = 54 : 6
X = 9
Vậy x bằng 9 bn nha
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( x+x+x+x+x+x) + (9-8+7-6+5-4)=63,6
x x 6 +3=63,6
x x 6 = 63,6-3
x x 6 =60,6
x =60,6:6
x =10,1
nha bn
cam on bn nhieu
Ta có:
(x + 9) + (x - 8) + (x + 7) + (x - 6) + (x + 5) + (x - 4) = 63,6
x + 9 + x - 8 + x + 7 + x - 6 + x + 5 + x - 4 = 63,6
(x + x + x + x + x + x) + (9 - 8 + 7 - 6 + 5 - 4) = 63,6
6x + 3 = 63,6
6x = 63,6 - 3
6x = 60,6
x = 60,6 : 6
x = 10,1
Vậy x = 10,1
5*(4+6*x)=290
4+6*x =290:5
4+6*x =58
6*x =58-4
6*x =54
x =54:6
x =9
Vậy x=9
4+6.x=290:5
4+6.x=58
6x=58-4
6x=54
x=54:6
x=9